1 files changed, 170 insertions, 0 deletions
diff --git a/src/glsl/pp/sl_pp_extension.c b/src/glsl/pp/sl_pp_extension.c
new file mode 100644
index 0000000000..67b24404d4
--- /dev/null
+++ b/src/glsl/pp/sl_pp_extension.c
@@ -0,0 +1,170 @@
+/**************************************************************************
+ * 
+ * Copyright 2009 VMware, Inc.
+ * All Rights Reserved.
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ * 
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+ * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ * 
+ **************************************************************************/
+
+#include <stdlib.h>
+#include <string.h>
+#include "sl_pp_process.h"
+#include "sl_pp_public.h"
+
+
+int
+sl_pp_context_add_extension(struct sl_pp_context *context,
+                            const char *name,
+                            const char *name_string)
+{
+   struct sl_pp_extension ext;
+
+   if (context->num_extensions == SL_PP_MAX_EXTENSIONS) {
+      return -1;
+   }
+
+   ext.name = sl_pp_context_add_unique_str(context, name);
+   if (ext.name == -1) {
+      return -1;
+   }
+
+   ext.name_string = sl_pp_context_add_unique_str(context, name_string);
+   if (ext.name_string == -1) {
+      return -1;
+   }
+
+   context->extensions[context->num_extensions++] = ext;
+   return 0;
+}
+
+int
+sl_pp_process_extension(struct sl_pp_context *context,
+                        const struct sl_pp_token_info *input,
+                        unsigned int first,
+                        unsigned int last,
+                        struct sl_pp_process_state *state)
+{
+   int extension_name = -1;
+   int behavior = -1;
+   struct sl_pp_token_info out;
+
+   /* Grab the extension name. */
+   if (first < last && input[first].token == SL_PP_IDENTIFIER) {
+      extension_name = input[first].data.identifier;
+      first++;
+   }
+   if (extension_name == -1) {
+      strcpy(context->error_msg, "expected identifier after `#extension'");
+      return -1;
+   }
+
+   /* Make sure the extension is supported. */
+   if (extension_name == context->dict.all) {
+      out.data.extension = extension_name;
+   } else {
+      unsigned int i;
+
+      out.data.extension = -1;
+      for (i = 0; i < context->num_extensions; i++) {
+         if (extension_name == context->extensions[i].name_string) {
+            out.data.extension = extension_name;
+            break;
+         }
+      }
+   }
+
+   /* Grab the colon separating the extension name and behavior. */
+   while (first < last && input[first].token == SL_PP_WHITESPACE) {
+      first++;
+   }
+   if (first < last && input[first].token == SL_PP_COLON) {
+      first++;
+   } else {
+      strcpy(context->error_msg, "expected `:' after extension name");
+      return -1;
+   }
+   while (first < last && input[first].token == SL_PP_WHITESPACE) {
+      first++;
+   }
+
+   /* Grab the behavior name. */
+   if (first < last && input[first].token == SL_PP_IDENTIFIER) {
+      behavior = input[first].data.identifier;
+      first++;
+   }
+   if (behavior == -1) {
+      strcpy(context->error_msg, "expected identifier after `:'");
+      return -1;
+   }
+
+   if (behavior == context->dict.require) {
+      if (out.data.extension == -1) {
+         strcpy(context->error_msg, "the required extension is not supported");
+         return -1;
+      }
+      if (out.data.extension == context->dict.all) {
+         strcpy(context->error_msg, "invalid behavior for `all' extension: `require'");
+         return -1;
+      }
+      out.token = SL_PP_EXTENSION_REQUIRE;
+   } else if (behavior == context->dict.enable) {
+      if (out.data.extension == -1) {
+         /* Warning: the extension cannot be enabled. */
+         return 0;
+      }
+      if (out.data.extension == context->dict.all) {
+         strcpy(context->error_msg, "invalid behavior for `all' extension: `enable'");
+         return -1;
+      }
+      out.token = SL_PP_EXTENSION_ENABLE;
+   } else if (behavior == context->dict.warn) {
+      if (out.data.extension == -1) {
+         /* Warning: the extension is not supported. */
+         return 0;
+      }
+      out.token = SL_PP_EXTENSION_WARN;
+   } else if (behavior == context->dict.disable) {
+      if (out.data.extension == -1) {
+         /* Warning: the extension is not supported. */
+         return 0;
+      }
+      out.token = SL_PP_EXTENSION_DISABLE;
+   } else {
+      strcpy(context->error_msg, "unrecognised behavior name");
+      return -1;
+   }
+
+   /* Grab the end of line. */
+   while (first < last && input[first].token == SL_PP_WHITESPACE) {
+      first++;
+   }
+   if (first < last) {
+      strcpy(context->error_msg, "expected end of line after behavior name");
+      return -1;
+   }
+
+   if (sl_pp_process_out(state, &out)) {
+      return -1;
+   }
+
+   return 0;
+}